跨页投递 [英] cross page posting

问题描述

我只是想跨页投递的例子。 我已经添加1文本框和放大器; 1按钮Default.aspx页

i am just trying the example of cross page posting. i have added 1 textbox & 1 button to default.aspx page

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
 <asp:Button ID="Button2" runat="server" Text="Button"  PostBackUrl="~/About.aspx"/>

我增加了以下code至code-背后about.aspx页的文件

i have added following code to code-behind file of about.aspx page

protected void Page_Load(object sender, EventArgs e)
    {
        if (Page.PreviousPage != null)
        {
            TextBox SourceTextBox =
                (TextBox)Page.PreviousPage.FindControl("TextBox1");
            if (SourceTextBox != null)
            {
                Label1.Text = SourceTextBox.Text;
            }
            else
                Label1.Text = "no value";
        }
        else
            Label1.Text = "no value from previous page";
    }

当我进入TextBox1中与放一些文字;点击按钮，它进入about.aspx但标签显示值没有价值，它没有显示TextBox1中的文本值，这是为什么不正常？

when i enters some text in textbox1 & clicks button, it goes to about.aspx but label shows value "no value", its not showing textbox1's text value, why this is not working properly?

推荐答案

如果您有母版页则code 页previousPage.FindControl（TextBox1的）; 无法工作，因为 TextBox1的是的ContentPlaceHolder。，必须先找到<$ C $下C>的ContentPlaceHolder。，然后找到 TextBox1的

If you have master page then the code Page.PreviousPage.FindControl("TextBox1"); not work because the TextBox1 is under the ContentPlaceHolder. and must first locate the ContentPlaceHolder. and then find the TextBox1

但是有得到的值的最简单的方法如下：

But there is an easiest way to get the value as:

将这个previous页：

Place this on the previous page:

public string TextFromBox1
{
    get
    {
        return TextBox1.Text;
    }
}

和重定向页面上声明什么是对的aspx为previous页：

and on the redirect page declare what is the previous page on aspx as:

<%@ Reference Page ="~/PreviousPageName.aspx" %>

和code背后获得的价值为：

and on code behind get the value as:

if (Page.PreviousPage != null)
{
    if (Page.PreviousPage is PreviousPageClassName)
    {
        Label1.Text = ((PreviousPageClassName)Page.PreviousPage).TextFromBox1;
    }
    else
    {
        Label1.Text = "no value";
    }
}
else
    Label1.Text = "no value from previous page";

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